You have to start your app with a command. There are several ways to do this. Open your github repo service, navigate to the settings page and find "Custom Start Command", type the command you typically use to run on your local pc (for e.g. python manage.py runserver). Just make sure to use a production-safe command if you're planning on going live with your project.

depending on what coding language you can expose the project to the web and have an endpoint that receive commands. There must be necessary authentication in place though since its public. using POST method sending the command in the body of the response with a password.

"The best approach is to use GitHub and keep all your code files in a Git repository. Then, register on Railway using your GitHub account. Once logged in, create a new service, choose GitHub, and select your repository. Railway will automatically pull your code from the repo and deploy it. Any future updates you push to GitHub will also be auto-pulled and redeployed by Railway